calm β A calm person does not show or feel any worry, anger, or excitement.
undisturbed β marked by symptoms of mental illness: a disturbed personality.
composed β If someone is composed, they are calm and able to control their feelings.
cool β Something that is cool has a temperature which is low but not very low.
stable β a building for the lodging and feeding of horses, cattle, etc.
steady β firmly placed or fixed; stable in position or equilibrium: a steady ladder.
equable β (of a person) not easily disturbed or angered; calm and even-tempered.
imperturbable β incapable of being upset or agitated; not easily excited; calm: imperturbable composure.
peaceful β characterized by peace; free from war, strife, commotion, violence, or disorder: a peaceful reign; a peaceful demonstration.
placid β pleasantly calm or peaceful; unruffled; tranquil; serenely quiet or undisturbed: placid waters.
serene β calm, peaceful, or tranquil; unruffled: a serene landscape; serene old age.
tranquil β free from commotion or tumult; peaceful; quiet; calm: a tranquil country place.
non-excitable β easily excited: Prima donnas had the reputation of being excitable and temperamental.
unruffled β calm; not emotionally upset or agitated; steady; unflustered: He became all excited, but she remained unruffled.
well-balanced β rightly balanced, adjusted, or regulated: a well-balanced diet.
collected β An author's collected works or letters are all their works or letters published in one book or in a set of books.
assured β Someone who is assured is very confident and relaxed.
complacent β A complacent person is very pleased with themselves or feels that they do not need to do anything about a situation, even though the situation may be uncertain or dangerous.